"Throttle Users" Reverse Proxy

A Node.js and Redis-based proxy that allows only a maximum number of users into the site. Once the maximum count is reached, subsequent users are placed into a queue until the active users start leaving.

Setup

1. Run npm install
2. Start Redis and configure the host/port in proxy.js
3. Change baseUrl (default http://localhost:80) or the listening port (default 9000) if needed in proxy.js
4. On one web server run, node.js proxy.js --cleanup (this enables the background process to cleanup expired sessions)
5. On all other web servers run, node.js proxy.js (you don't want the cleanup process running on more than one server)
6. Point your load balancer to port 9000 instead of 80 (or changed values)